Connect two or more Docker servers together sharing container ports between them via a WireGuard tunnel.

For example a Docker server without a public IP address behind a NAT can expose container ports to another Docker server that has a public IP address to allow incoming connections.

This assumes that you have already setup a subdomain DNS entry for your domain, for example:
wireguard-tunnel.example.com

Will accept connections on behalf of a peer and tunnel them to the designated peer.

docker-compose.yml

services:
  wireguard-tunnel-server:
    image: ghcr.io/digitallyrefined/docker-wireguard-tunnel:v3
    container_name: wireguard-tunnel-server
    environment:
      # Update to your domain
      - DOMAIN=wireguard-tunnel.example.com
      # Number of peers to auto generate config for
      - PEERS=1
      # Services to expose format (comma-separated)
      # SERVICES=peer-id:peer-container-name:peer-container-port:expose-port-as
      - SERVICES=peer1:nginx:80:8080,peer1:nginx-demo:80:8081
    cap_add:
      - NET_ADMIN
    volumes:
      - ./config:/etc/wireguard
    restart: unless-stopped
    ports:
      - '51820:51820/udp'
      - 8080:8080
      - 8081:8081

docker compose up -d
docker compose logs -f

Once started, a peer1.conf file will be automatically generated in the config directory.

Will connect to the server via WireGuard and setup a tunnel to expose the listed ports.

Move the config/peer1.conf file from the server that was automatically generated and rename it to config/wg0.conf on the peer.

docker-compose.yml

services:
  wireguard-tunnel-peer:
    image: ghcr.io/digitallyrefined/docker-wireguard-tunnel:v3
    container_name: wireguard-tunnel-peer
    environment:
      # Note that DOMAIN & PEERS are not required for the peer
      # Services to expose format (comma-separated)
      # SERVICES=peer-id:peer-container-name:peer-container-port:expose-port-as
      - SERVICES=peer1:nginx:80:8080,peer1:nginx-demo:80:8081
    cap_add:
      - NET_ADMIN
    volumes:
      - ./config:/etc/wireguard
    restart: unless-stopped
    links:
      - nginx:nginx
      - nginx-demo:nginx-demo

  nginx:
    image: nginx
    restart: unless-stopped

  nginx-demo:
    image: nginxdemos/hello
    restart: unless-stopped

docker compose up -d
docker compose logs -f

Note: if you have a firewall in front of your server you will need to allow connections on port 51820/udp for the WireGuard server, and connections on ports 8080 and 8081 for the 2 demo nginx servers.

Once started you should be able to access both nginx servers via their exposed ports on the WireGuard server, for example:
wireguard-tunnel.example.com:8080 and wireguard-tunnel.example.com:8081

You may want to combine the WireGuard tunnel server with Traefik or Nginx Proxy Manager or use a 3rd party service such as Fly.io.

Examples using Docker WireGuard Tunnel with:

• Traefik to automatically provision TLS/HTTPS certificates
• Fly.io to provision a server, subdomain and TLS/HTTPS certificates